The kawaii metal band will release their new single 'From Me To U', featuring Poppy, on Friday (April 4)
The stream will take place on March 21
She previously joined Knocked Loose during their performance on the late night show as a special guest
Previous surprise appearances have come from Parkway Drive, Bullet For My Valentine and Metallica
The soundtrack comes weeks ahead of the release of this year's edition of the long-running wrestling game series
It’ll be returning to its usual Donington Park site between June 13 and 15
Poppy also throws in a cheeky nod to Divinyls' 'I Touch Myself'
"We are all Poppy"
An interviewer mistook the frontwoman for Poppy while on the red carpet
“I am Poppy, and I am really happy to be here, nominated with Knocked Loose. I really hope we win... or Spiritbox and Courtney”